1. © Copyright IBM Corporation 2014 Getting started with Rational Engineering Lifecycle Manager queries Andy Lapping – Technical sales and solutions Joanne Scouler – Curriculum architect

2. 2 © Copyright IBM Corporation 2014 Agenda Linked data and Open Services for Lifecycle Collaboration (OSLC) The information model Basic concepts and terminology Linked data RDF Triples SPARQL Creating queries– live demo

3. 3 © Copyright IBM Corporation 2014 Resources OSLC resources: Introduction to Linked Data and OSLCIntroduction to Linked Data and OSLC by Amanda Brijpaul Linked DataLinked Data by Ben Williams Linked Data InterfacesLinked Data Interfaces by Arthur Ryman REST resources: DeveloperWorks REST resourcesDeveloperWorks REST resources – The Basics Learn about rest web services RDF, TRS, SPARQL, LQE- http://www.w3.orghttp://www.w3.org

4. 4 © Copyright IBM Corporation 2014 Rational engineering lifecycle manager Transition to a unified view on project, program & account info It is about accessing related information in job related tools across the information base to increase the collective wisdom Analysts Quality Professionals Release Engineers Developers Architects Project Managers

5. 5 © Copyright IBM Corporation 2014 Linked data in Rational engineering lifecycle manager Electrical Design Mechanical Design / PDM Embedded Software Design about HTTP/REST http://acme.com/TestCasehttp://acme.com/Requirement Requirements Test Architecture Change Products The Web has proven to be the most scalable, open, and flexible integration technology

6. 6 © Copyright IBM Corporation 2014 OSLC links Link directly between tools – no need to import or duplicate data

7. 7 © Copyright IBM Corporation 2014 Demo linked data

8. 8 © Copyright IBM Corporation 2014 Data is indexed in Rational engineering lifecycle manager An index of tracked resources is created from domain tools that allows for cross-domain Lifecycle Queries Lifecycle Query Engine (Index)

9. 9 © Copyright IBM Corporation 2014 The information model  What information do you want to find with a query?  Know your information model  Know how your linkages are set up  What do you need to know before writing a query?

10. 10 © Copyright IBM Corporation 2014 Learning the language RDF – Resource Description Framework  A general purpose language for representing information in the web SPARQL - SPARQL Protocol and RDF Query Language  A query language for RDF TRS – Tracked Resource Set  TRS is an OSLC specification that allows server applications to make their resources and changes available to client applications. LQE – The Lifecycle Query Engine  A TRS client application

11. 11 © Copyright IBM Corporation 2014 Running queries  Query results available in http format  Pipes (XML) data to Rational Reporting for Document Generation (RRDG) / Rational Publishing Engine (RPE)

12. 12 © Copyright IBM Corporation 2014 Basic concept: triples A triple defines a relationship between things:  Subject – A uniquely identified thing  Predicate (also called property) – Some attribute of the subject – Denotes a relationship  Object – The actual value

13. 13 © Copyright IBM Corporation 2014 Triples Examples: subject object predicate subject object predicate

14. 14 © Copyright IBM Corporation 2014 RDF triples An RDF triple is sometimes called a statement  Every piece of an RDF triple can have a URL  Commonly referred to as a resource http://men.com#William http://relations.com/isMarriedTo http://women.com#Catherine SP O

15. 15 © Copyright IBM Corporation 2014 RDF triples form graphs A set of triples is called an RDF graph  Graphs have nodes and edges  An RDF database is sometimes called a triple store Node Edge

16. 16 © Copyright IBM Corporation 2014 Types of node Resource node  A thing with a URL with links – Commonly represented as an oval Blank node  A resource with no URL with links Literal node  A value (strings, dates) - no URL and no links – Commonly represented as a rectangle An edge can go from any Node to any other Node. Exception: An edge cannot go from a Literal

17. 17 © Copyright IBM Corporation 2014 Triple patterns A triple pattern is like an RDF triple – except that each of the S,P,O may be a variable (denoted by a preceding ? symbol) ?resource rdf:type oslc_qm:TestCase. Variable Variables are like a wildcard – they match any node – resource or literal. The period terminates the statement We will discuss what rdf:type and oslc_qm:TestCase mean in a moment

18. 18 © Copyright IBM Corporation 2014 RDF vocabularies In order for ‘anything’ to connect to ‘anything else’ – there must be some common language.  An RDF Vocabulary is the set of URLs for the resources in the graph ?resource http://www.w3.org/1999/02/22-rdf-syntax-ns#type http://open-services.net/ns/qm#TestCase From the OSLC Quality Management Vocabulary From the standard RDF vocabulary

19. 19 © Copyright IBM Corporation 2014 Prefixes Prefixes are used in SPARQL to allow queries to be shortened (instead of writing the full URL to the resource)  The following queries are equivalent ?uri http://open-services.net/ns/qm#testsChangeRequest ?tests_cr. PREFIX oslc_qm: ?uri oslc_qm:testsChangeRequest?tests_cr. SPO SPO

20. 20 © Copyright IBM Corporation 2014 Anatomy of a query PREFIX oslc_qm: PREFIX dcterms: PREFIX rdf: SELECT ?uri WHERE { ?uri rdf:type oslc_qm:TestCase. } SELECT ?variable ?variable Identifies the variables to appear in the results (this is called projection) Each projected variable will be a column in the results table SELECT * will display all variables specified in the WHERE clause WHERE { basic graph pattern } Identifies the basic graph pattern to match against the data pattern

21. 21 © Copyright IBM Corporation 2014 A simple query with results PREFIX oslc_qm: PREFIX dcterms: PREFIX rdf: SELECT ?uri WHERE { ?uri rdf:type oslc_qm:TestCase. } Pattern matches Projected ?uri variable

22. 22 © Copyright IBM Corporation 2014 Queries

23. 23 © Copyright IBM Corporation 2014 Creating a query When a query is created some sample SPARQL is added Although this can be executed the results will mean very little

24. 24 © Copyright IBM Corporation 2014 Create queries demo

25. 25 © Copyright IBM Corporation 2014 Appendix

26. 26 © Copyright IBM Corporation 2014 Blank nodes in Rhapsody Using this technique we can discover how to extract various resources in Rhapsody Some may have multiple blank nodes to traverse